/* popup 弹层 */
.m-popup {
    position: fixed;
    z-index: 99;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, .85);
    opacity: 0;
    visibility: hidden;
    transition-duration: .25s;

    .maxwidth();

    &.on {
        visibility: visible;
        opacity: 1;
    }

    //- 分享图片
    .share-img {
        position: absolute;
        top: 10px;
        right: 15px;
        width: 80%;
    }
}